Trimethyl hexadecyl ammonium

The same authors also applied the solution blending procedure to the preparation of LLDPE composites with a MMT organically modified with M3(Ci6)i (trimethyl hexadecyl ammonium ions). Intercalated nanocomposites were obtained, characterized by interlayer distances iooi of 3.54-3.85 nm, for organoclay loadings of 10-5 wt%, respectively (Figure 3.5). 

PCL/layered silicate nanohybrids have also been synthesized by ring opening polymerization of CL according to a well-controlled eoordination-insertion mechanism. MMT were surface-modified by non-functional (trimethyl hexa-decyl ammonium) and hydroxyl functional alkylammonium cations, i.e., (2-hydroxyethyl) dimethyl hexadecyl ammonium. The hydroxyl funetions available at the clay surface were activated into tin (II or IV) or A1 (III) aUcoxide initiators for lactone polymerization, thus yielding surface grafted PCL chain. 

Sonawane et al. [90] investigated the affect of ultrasound and nanoclay for the adsorption of phenol. Three types of nanoclay tetrabutyl ammonium chloride (TBAC), N-acetyl-N,N,N trimethyl ammonium bromide (CTAB) and hexadecyl trimethyl ammonium chloride (HDTMA), modified under sonication, were synthesized which showed healthier adsorption of phenol within only 10 min in waste water. The interlamellar spacing of all the three clay increased due to incorporation of long chain quaternary salts under cavitational effect. 

SBA-15 samples with diameters from 5 to 10 nm have been prepared by tuning the temperature of the first step of the synthesis [5], MCM-41 has been prepared in the presence of hexadecyl trimethyl ammonium by using methylamine as pH-controlling agent [6], The pore size from N2 adsorption at 77 K has been evaluated by the Broekhoff and de Boer method, shown to correctly evaluate the pore size of ordered mesoporous silicas [7]. 

The determination of alkyltrimethyl ammonium compounds with the general formula RN (CH3)3X surfactant were performed using CF-FAB and ESI. The compounds examined were dodecyl-, tetradecyl-, and hexadecyl-trimethyl ammonium compounds dissolved in water. The product ion spectra of dodecyltrimethyl ammonium compound and its methyl-deuterated homologue were presented. The product ion at m/z 60 [(CH3)3NH]+of the non-deuterated compound at m/z 228 was the only ion that shifted after deuteration to m/z 69 [38],... 

Figure 6.14 Flow curves for sodium kaolinite at pH 4. The two systems are differ only by the addition of hexadecyl trimethyl ammonium bromide (HDTAB)...

Fulvic acids from fulvic acids, water Hexadecyl trimethyl ammonium modified clinoptilolite Ethanol [237]... 

Numerical data are available from our earlier penetration work for a number of monolayer/surfactant systems. The simplest of these systems was selected for this initial analysis the penetration of cholesterol monolayers by hexadecyl-trimethyl-ammonium bromide (CTAB) J). Cholesterol monolayers at 298 K exhibit a single, highly incompressible, condensed phase with the transition to a gaseous phase occurring at a negligibly low surface pressure. CTAB does not appear to undergo surface hydrolysis (10) and the gaseous-to-expanded phase transition occurs at a low concentration (0.043 mmol kg ) and a low surface pressure (1.0 mN m l). 

Lundqvist, H., Eliasson, A.-Ch., Olofsson, G. (2002a) Binding of hexadecyl trimethyl-ammonium bromide to starch polysaccharides. Part I. Surface tension measurements. Carbohydrate Polymers, 49, 43-55. 

Figure 8.10a is an example of some data in which the effect of added salt is more than a competitive ion-binding phenomenon. The reaction involved is the decarboxylation of 6-nitrobenzisoxazole-3-carboxylate, catalyzed by hexadecyl trimethyl ammonium bromide micelles ... 

Ionescu et al.J measured the CMC of hexadecyl trimethyl ammonium bromide in water-dimethyl sulfoxide (DMSO) mixtures at 25 and 40°C ... 

Use these data to evaluate AG C for hexadecyl trimethyl ammonium bromide and to estimate (remember, only two temperatures were measured) AH%,c and AS C. Discuss the values obtained in light of infrared and NMR experiments, which indicate formation of the stoichiometric compound DMS0-2H20 at xDMSO = 0.33. 

Duynstee and Grunwald present some experimental data for Reaction (F) in the presence of hexadecyl trimethyl ammonium bromide (CTABr, C = cetyl) and sodium dodecyl sulfate (NaLS, L = lauryl). Sodium hydroxide was the source of OH" in all cases. A pseudo-first-order rate constant of 2.40 x 10-2 s-1 is observed for A CTABr. Use the following absorbance data to evaluate NaLS for this reaction ... 

The reaction of Problem 10 was studied at two different temperatures, and, from the temperature dependence of the rate constants, the authors determined AH% and ASJ, the enthalpy and entropy of activation, respectively. The following values of these parameters were obtained in pure water and in 0.01 M sodium dodecyl sulfate (NaLS) and 0.01 M hexadecyl trimethyl ammonium bromide (CTABr) ... 

Sheiham and T. A. Pinfold, The solvent sublation of hexadecyl-trimethyl-ammonium chloride. Separation Science 7(1), 43-50 (1972). 

As in the case of the concentration dependence of the chemical shift, the H and 13C band shapes of the surfactant resonance peaks are also concentration dependent. Analysis of H NMR band shapes for large aggregates of a cetyl trimethyl ammonium bromide-water system results in a CMC of 1.0 mM this is consistent with the value measured by other methods.57 The H NMR bands of alkyl trimethyl ammonium salicylate and hexadecyl pyridinium salicylate aqueous systems start to broaden at concentrations just above the CMC. The broadening continues up to a concentration above which the band shape is almost constant, as the concentration is further increased.-58 I3C NMR linewidth analysis of sodium octanoate in aqueous solution gives reasonable estimated CMC values.59... 

Salgaonkar, L.P. and Jayaram, R.V., Polyaniline film formation in hexadecyl trimethyl ammonium bromide admicelles on hydrous zirconia surface, J. Colloid Interf. Sci., 291. 92, 2005. 

Lin and Long [41] applied ELM to effectively separate nitrate ions (94% efficiency) from water with tri-n-octyl amine as the extractant and sodium carbonate as the internal phase. H+ ions were also transported along with NOs from external to the internal phase (cotransport). Kobya et al. [86] studied the kinetics of thiocyanate ion removal from aqueous potassium thiocyanate solution by counter-transport process using quaternary ammonium salt of hexadecyl trimethyl ammonium chloride as the cander and sodium chloride solution as the stripping phase. 

In the case of surfactants it has been observed that sodium dodecylsulfate (SDS), Tergitol 7 [sodium 4-ethyl-1(3-ethylpentyl)octyl sulfate], and CTAB [hexadecyl(trimethyl)ammonium bromide] increase the solubility of Ss in water dramatically, provided the critical concentration for micelle formation is exceeded. For instance, 50 g 1 SDS enhance the solubility of Ss at 20 °C from 5 ng to 20 mg 1 i.e., by a factor of 4000. This enhanced solubility increases further with increasing temperature. It is believed that the surfactant molecules form micelles and that the Ss molecules dissolve in the hydro-phobic interior of these micelles in a similar fashion as in a liquid hydrocarbon solvent [16]. 

Section 3.1.4) (HI8, PI). In a recent study of surfactants (Bl), hexadecyl trimethyl ammonium chloride (CTAC) produced a significant increase in the emission intensity of acridinium ester-labeled albumin, but Triton X-100 exerted a larger enhancing effect than CTAC on a similarly labeled antibody. 

Die Hydrolyse von Trichlormethyl-benzol zu Benzoesaure wird wesentlich beschleunigt, wenn man in Ge-genwart von 0,01 M Hexadecyl-trimethyl-ammonium-bromid als Phasentransfer-Katalysator arbeitet169. 

Almost the same behaviour was found for a higher homologue of this series - octadecyl trimethyl ammonium bromide [70]. A satisfactory agreement between the molecular areas at the CMC evaluated from neutron reflection and surface tension data was obtained too. Two other homologues of this series, dodecyl and hexadecyl trimethyl ammonium bromide, were investigated in [71, 72]. Labelling of blocks of two or four atoms in the surfactant molecules allowed the authors to determine the structure of the adsorbed layer at the CMC. It was shown that the inner part of the carbon chain adjacent to the head group is oriented closer to the... 

CAS 112-02-7 EINECS/ELINCS 203-928-6 Synonyms Cetyl trImethyl ammonium chloride Hexadecyl trImethyl ammonium chloride Palmityl trImethyl ammonium chloride N,N,N-Trlmethyl-1-hexadecanamlnium chloride Classification Quaternary ammonium salt Empirical Ci9H42CIN Formula C,6Hss(CH3)3NCI Properties M.w, 320.01 cationic Toxicology TSCA listed... 

Hexadecyl palmitate. See Cetyl palmitate Hexadecyl sodium sulfate. See Sodium cetyl sulfate Hexadecyl trimethyl ammonium chloride. See Cetrimonium chloride Hexaetlr ene glycol. See PEG-6... 

N-laurylsarcosine and is made by mixing the CTAB (hexadecyl trimethyl ammonium bromide) and sarcosine together to form a paste before adding the rest of the solution. The EDTA is added last and the buffer is autoclaved. 

A nylon 66 clay nanocomposite was produced using the dry-compound method [26]. Co-intercalation organophihc clay was used as the clay base. Na-montmorillonite was first processed using hexadecyl trimethyl ammonium ions and epoxy resin. It was then kneaded using a twin screw extruder to make a clay nano composite. As the amount of clay that was added increased, the amount of y (gamma) phases increased. This is thought to be due to the strong interactions between the nylon 66 chains and the sinface of the clay layers. 

Cetrimonium tosylate CAS 138-32-9 EINECS/ELINCS 205-324-8 Synonyms Cetyl trimethyl ammonium p-toluene sulfonate Hexadecyl trimethyl ammonium p-toluene sulfonate N,N,N-Trimethyl-1-hexadecanaminium salt with 4-methylbenzenesulfonic acid Classification Quaternary ammonium compd. Empirical C26H49NO3S Formula [Ci6H33(CH3)3N]0S02C6H4CH3 Properties Stable to high temps. 

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